Abstract: The purpose of the present work is finding of opportunities of subsurface sensing with the help of a continuous noise signal. For a basis the reflectometer used for the definition of soil moisture is taken. Model calculations for cases of large flat (l greater than $lambda@) and small (l less than $lambda@) spherical objects were carried out in order to estimate the object detection depth and its dependence on the bandwidth of the device and physical properties of the ground. The calculation was made both for monochrome and for broadband noise signals. As a result of modeling and experimental researches it is found out that the use of a broadband signal improves the conditions of recognition such an object which is at a small depth on its reflectivity. For detecting an object in a homogeneous medium without recognition its type the set of 3 - 8 monochrome signals distinguished by their frequency is more suitable. The broadband signal in some cases has an advantage in detecting of object in the ground with large- scale inhomogeneous media of permittivity. !3
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